Plug or thread gage



UNITED STATES PATENT orifice.

FRANK o. lrroAefnArTD, or BRIDGE'PORT. CONNECTICUT.

PLUG on. rHnEAn GAGE.l

To all whomz't mag/concern: e Be it known that I, FRANK O. HOAGLAND, a citizen vof the United States, residing'at Bridgeport, in the county of Fairfield and State of Connecticut, have invented certain new and useful Improvements in Plug or Thread Gages, of which the'following is a specification. n Y f 4 The invention relates particularly to "plug or thread gagesjhaving the' gage members formed separately fromgthe handles, Veach gage member having a cylindrical shank which ts a cylindrical aperture in the handle. Theobject of the inventionfisv to provide improvedA means for locking theshank in place in the'handle aperture.

ln the accompanying drawing, `which shows severalembodim'ents of the invention,

Figure 1 is a side view` of a combined plug and threadgage.

Fig. 2 is a side view 'of a taper pluggage.

Fig. 3 is a transverse sectional view, on an enlargedscale, taken along the line 3-3 of Fig. l or the line of Fig. 2.

Fig ing a slightly differentvembodiment of the invention. e e I Figs. 5 and 6 are endand side views respectively of a different form of taper pin.

Fig. 7 is a view'similar to Figs. 3 and 4 but showing thel construction adapted for the taper pin shown in'Figs. 4 and `5,.

Referring to Vthe. drawing, l and 2 are gage members, the-member l being provided with gaging surfaces 'thereon adapted for gaging screw threads, rand the member 2 being provided with a singlegagingsurface thereon adapted for gagingv a cylindrical hole. The two members l and 2 are secured to a handle 3, these members being provided respectively with cylindrical shanks 4 and 5 drical aperture 6 inthe handle 3. The'shank n 5a is held in placeby a transverse pin 7.

My invention relates particularly to thev arrangement of parts whereby the pin serves to lock the shank in place in the handle.

'. 4 isa view ysimilar to Fig. 3 but showspecification of Letters Patenti Patented ,Aug- 24,1920, Application meaNovemter' 9,1918.` serial N. 261,779.

in many respects similar to those herein setforth have been heretofore con-v structed, but these gages have been open to vcriticism because of thepo'ssibili'ty of loosethe connection would permit the handleto be shaken, thus indicating a looserfit .offthe gage in thev hole, whereas, as a matter of fact, the gage might fit the hole perfectly.

Fig. 3 is an enlargedcro'ss sectional view of the pin connection, this view showing the aperture in the handle vsomewhat larger than the shank of the gage member. This difference is considerably exaggerated in order that the invention may be more clearly understood. It willmbe obvious that with an ordinary pin connectionv there would bea possibility of the handle being shaken with respect to the gage member. f Such relative shaking, however, is entirelyeliminatedby `my* invention.

The pin 7, as shown in Fig. 3, is circular in cross section and tapers uniformly from one end to the other. Two approximately central opposite cylindricall holes 8 and 9 are drilled in the handle, these holes being' large enough to permit'the pin 7 to be freely insertedl VAs vshown in Fig. 3, these holes areof the same diameter and are in alinement. A hole 10, preferably of the same diameter as the'holes 8 and9, is drilled in the shank 5, and this hole 10, while approximately central, is laterally offset to a slight extent so as to be out of eXact register with the handle holes. `With the holes 8, 9 and 10 drilled as above set forth, the pin 7 is inserted and drivenl into place. It will be seenthat as the result of the lateral offsetting ofthe hole 10 the pin 7 will bear at one side against the walls of the handle holesS and 9 along the lines 8. and 9', and will bear at the other side Vagainst the opposite wall of the shank hole l0 along the line 10. In this way the shank 5 is forced to one side of the aperture G and into firm engagement with one wall thereof, thus entirely preventing any looseness of connection.V

Fig. 4 shows a construction which is the same as that shown in Fig. 3 except that the handle hole for receiving the smaller end of the pin 7 is smallerfthan the handlehole for receiving the larger end of the pin. This smaller hole is indicated by 9,anditvw1llbe Observed that this hole is so positioned that Vthe upper wall thereorl at the line 9' is 1in exact alinementwith the upper wall of the hole 8 at the line 8. vThe smaller ihole '92?, as show-n in Fig. 4, is in many casesprefer-V able 4as it 'leavesvless clearanceV aroundthe pin, thus' improving the appearance and avoidin'githe collection of dirt.

Figs. 5 and'G show a tapered pin 11 which is somewhat different from the pin 7.` This pinh'as two'oppos'ite converging cylindrical surfaces 1l? and 11b, each having the Vsame y radius r. WhenV this Apin l11 vis to be used,

. face contact therewith inasmuch as the the holes in the handle and in the shank are drilled as 'shown in l1`ig,'7,.the radius 'of all of the holes beingvthe same as the radius-r' of the "pin surfaces 'lln and l11b.

pinl 1l is putin'place the action will be simi-k `When the larto that described in'connection with F ig. 3. However", the 'surface lla, instead of hav' inglinecontact at S 'and`9 withfthe walls ofthe holes 8 and-9, will have broad surradius of the ysurface lla'is the same as the radius of the holes, Similarly, the surface 1l?, insteadfof having line contact at l0 with the wall of thehole l0, will'havebroadl surfacecontacttherewith inasmuch 'as the radius of the'surface l11b 'is the same asthc radius ofthe hole.

'What I claim is: A

l. TheV combination of a gage member provided with a gaging surface thereon and having acylindrical shank, a handle having av cylindrical aperture for receiving and oloselyfitting the shank,`and a tapered pin otapproximately circular cross section for Y securing the shank in place, the handlehaving two fapproximately central opposite transverse cylindrical pin-receiving holes arranged with their walls 1n ahnement lat one side and the shank having a transverse cylindrical pin-receiving lhole which is'approXiInately central but which is Vlaterally offset on the side of the said alined walls Vout of-vexa'ct registerfwith'zthe handle holes,

the last said hole 'being of such diameter thatf'the :pin bears at one sideragainrst the n 'Y alined walls of the handle holes and at the `otherside against theY opposite 'wall of the shank hole.V

f2. The combination'of a gage member provided with a gaging surface thereonand .p

having a cylindrical shank, a"handle having" a cylindrical aperture for` receiving `and closely lIittingtheV shank, and aY tapered pinV of approximately circul'areross section 'for' securingthe shank in 'pljace,',the`h`andle hay.V

ing 'two approximately central opposite transverse cylindrical"pin-receivingholes of the same diameter and the shank having a transverse 'cylindrical pin-receiving 'hole which 1s offthe sainediameter'andfapproximately central but which Lis vlzaeletliy offset out of exact register with the ,handle"holes,l

whereby the pin bears 'at onesid'e againstthe wallsof lthe handle holes andat the other side ao'ainst'the'vvall of'lth'e shank'hole.4 v

3. 'he combinatipnof a gage member provided with a gaging' surface," thereonand Yof the pin "whereby thepin 'has'bro'adjsurface contact fat one side against the walls'of the'ha'ndle holes andvhaslbroadfsurface contact at tl're 'otlier side "against'th'e, wall 'of thefshankhole.

Y In testimony whereof, I vhereto aiX Y signature.

FRANK e. t:HofAGLAN'D. 

